Aaeon MB-562 Manual page 94

The following four modes are Green PC power-saving functions which
are only user configurable when User Defined Power Management has
been selected. See above for available selections.
When enabled and after the set time of system inactivity, the hard disk
drive will be powered down while all other devices remain active.
When enabled and after the set time of system inactivity, the CPU
clock will run at slower speed while all other devices still operate at full
speed.
When enabled and after the set time of system inactivity, the fixed disk
drive and the video will be shut off while all other devices still operate
at full speed.
When enabled and after the set time of system inactivity, all devices
except the CPU will be shut down.
86 MB-562 User's Manual